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Fair Value Measurement and Financial Instruments - Summary of Fair Value Inputs and Assumptions (Details) |  | 12 Months Ended
--- | --- | ---
Jul. 02, 2018 $ / shares | Dec. 31, 2017 $ / shares
Estimated Fair Value of Convertible Preferred Stock | Series E |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 26.41 | 9.57
Estimated Fair Value of Convertible Preferred Stock | Series F |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 26.41 | 11.01
Exercise Price | Series E |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 19.55 | 19.55
Exercise Price | Series F |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 9.73 | 9.73
Remaining Term (in years) | Series E |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Remaining term (in years) | 4 years 6 months | 5 years
Remaining Term (in years) | Series F | Minimum |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Remaining term (in years) | 2 years 7 months 6 days | 3 years 1 month 6 days
Remaining Term (in years) | Series F | Maximum |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Remaining term (in years) | 6 years 6 months | 7 years
Risk-free Interest Rate | Series E |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 2.7 | 2.2
Risk-free Interest Rate | Series F | Minimum |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 2.6 | 2.0
Risk-free Interest Rate | Series F | Maximum |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 2.8 | 2.3
Expected Volatility | Series E |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 43 | 43
Expected Volatility | Series F |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 43 |
Expected Volatility | Series F | Minimum |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption |  | 43
Expected Volatility | Series F | Maximum |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption |  | 44
Dividend Yield | Series E |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 0 | 0
Dividend Yield | Series F |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value assumption | 0 | 0

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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